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Hotspots

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Why this lesson, and why the 3D

Hotspots is a fifteen-minute projector lesson, not a homework packet and not a film with a quiz bolted on. Put this hook on the board before you dim the lights: Hawaii and Yellowstone are holes the plate is sliding over — not the same as a plate edge. By the end of the slot a pupil should be able to draw the Hawaii chain and the Yellowstone track independently. Curriculum tags in the header (GCSE; NGSS MS-ESS2-3) are filters, not a flag. The room is worldwide; SI first; International English. Ages on the card (GCSE, A-level, NGSS MS, HS Earth Sci) are a suggested band, not a gate.

A UK class that dumps every volcano on the Ring of Fire will fail Hawaii and Yellowstone the moment they appear on a map. Most volcanoes do sit on plate edges: Iceland on the Mid-Atlantic Ridge, Cascadia’s arc above a slab. Hawaii does not. It is a hole the Pacific plate is sliding over, a chain of islands and seamounts that get older to the northwest. Yellowstone is the continental analogue: calderas older to the southwest along the Snake River Plain. Two plumes. One idea. Do not teach one plume for both. The United Kingdom rides Eurasia far from either track, which is why British volcanoes are deep-time history, not a live hotspot. United States exam maps pair Hawaii with Yellowstone for a reason: ocean plate versus continent, same mechanism. If all volcanoes were plate-boundary volcanoes, those two tracks would be a mystery and plate motion would lose its best interior clock. Kola never sampled a plume. Age direction on the chain is the clock we actually have.

The 3D is a named, inspectable object. Click the part, not a caption. If the model will not spin, the Why panel still carries the mechanism, the two photographs, and the film. Do not apologise for the model. Drive it. A silent spin teaches a screensaver. A named mesh that changes under a slider teaches the process.

Fifteen minutes on the projector

Leave Hawaii on. Young island, older seamounts northwest. The chain is the Pacific plate sliding over a plume, not a plate edge. Ask which way the plate is going from the age direction. Toggle Yellowstone on. Calderas older to the southwest. Two plumes. One idea. Do not teach one plume for both. All volcanoes are not plate-boundary volcanoes. That is the misconception. Hotspots are the exception that proves motion. Iceland is a ridge with a plume bonus, not a Hawaii copy. Cascadia is subduction, not this. A plume can punch a plate interior. Hawaii is the type case. Yellowstone is a continental hotspot track, not a mid-ocean ridge. Finish in Check.

Open the lab full screen (F). Labels on (L). Speak the first step before you touch a slider: Hawaii: young island, older seamounts NW. Then the second: Yellowstone: calderas older to the SW. Then the third: Two plumes. One idea.

The sliders that earn their keep are Hawaii; Yellowstone. Space plays; arrows nudge time; R resets. Parameters the URL can remember: hawaii, yellowstone. If you only have eight minutes, skip the last step and finish in Check. Projector layout (P) is for the back row: one idea, large type, the model still live.

Leave the Hawaii toggle on. Press Space: the chain slides northwest while the plume stays. Left and right arrows scrub the same motion. Toggle Yellowstone on and read calderas older to the southwest. Two plumes — do not treat them as one. L toggles labels. R resets. P switches projector mode. E explode and X slice are idle here; there is no onion to pull apart. Ask which way each plate is going from the age direction before you name it. Then turn one track off so the class cannot blur them.

The in-site film is “What Are Volcanoes? Crash Course Geography #20” (Crash Course Geography, about 13 min, Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off.). Autoplay is off. Play one minute if you need a second voice; do not let the film eat the slot. The 3D still has to move under your hand.

What the third row will get wrong

You will hear the misconception before you have finished the first sentence. Write the false claim on the board and leave it there until the model has contradicted it. Do not skip this. A fluent pupil can recite the hook and still believe the false sentence.

“All volcanoes are plate-boundary volcanoes.” — no. Hotspots are the exception that proves motion.

“Hawaii and Yellowstone are one plume.” — no. Two plumes. One idea. Age tracks point different ways on different plates.

“Iceland is a Hawaii copy, and Yellowstone is a mid-ocean ridge.” — no. Iceland sits on a ridge with a plume bonus. Yellowstone is a continental hotspot. Cascadia is subduction.

Pitfalls to keep in your pocket: One plume for both. Dumping Hawaii on the Ring of Fire. Treating Iceland as a Hawaii copy, or Yellowstone as a mid-ocean ridge. Drawing the plume as a lava pipe you could climb. Do not let a pupil leave thinking the 3D is a photograph. It is a teaching model. Where vertical exaggeration exists, T collapses it and the caption says so. A labelled lie of scale is honest. An unlabelled one is a cartoon.

Two places, not a slogan

A hotspot is a long-lived mantle plume that can punch magma through a plate interior. The plume stays relatively fixed in the mantle frame; the plate slides. Hawaii: the active island is young; drowned seamounts and atolls age to the northwest along the chain, recording Pacific motion of centimetres per year. Yellowstone: a continental hotspot. Calderas and rhyolite ages young at the park, older toward the southwest. Cascadia is not this story. It is a subduction zone, a volcanic arc above a slab. Iceland is a ridge with a plume bonus, which is why it has a country on it, not a simple Hawaii copy. The model’s labelled lie is the pipe. The plume is drawn as a glowing cylinder you could climb. It is not. It is a thermal anomaly, schematic. Hawaii ages are a 0–10 Ma teaching set, not the full Emperor–Hawaiian bend. Yellowstone is a slab with a track tube, not a geologic map of the Snake River Plain. Motion is sped up by millions of years so a lesson can see the slide. What remains true: two independent plumes, age direction records plate motion, and not every volcano sits on a plate edge. That exception is the proof that plates move.

The first place to land is Hawaii. The second is Yellowstone. Same process, different rock or climate. If a pupil can only name one place, they have a postcard, not a mechanism. Atlas entries for those names are a click from the case list; send them back to the lab with one sentence they can say in Check.

Do not flatten the comparison into “this country versus that country.” Name the landform. Holderness is till, not chalk. Hawaii is a hotspot, not an island arc. Yosemite is a glacial trough, not a river canyon. The 3D is allowed to be schematic; the place names are not allowed to be sloppy.

Figures and the film

Field photograph: Lava entering the sea on a hotspot island. A plume, a track, ages one way. Credit: USGS, public domain.

Mechanism photograph: Field or official figure for teaching Hotspots. A second photograph for the projector script — not the lab cover. Credit: Wikimedia Commons / NASA / USGS.

Two photographs, two jobs. The field picture is the place. The mechanism picture is the process. Do not run the lesson on a single Apollo Earth disc. A carbon-cycle class is a forest and a seam, not a blue marble. An ENSO class is a Pacific temperature map, not Africa from Apollo 17.

Words they must be able to say

Say these out loud once while you click the matching mesh. If a word has no mesh, it still has a photograph in Terms.

Hotspot: Long-lived mantle plume that can punch a volcano through a plate interior. Seamount: Drowned volcano on the track. Older, farther from the active island. Mantle plume: A thermal upwelling, relatively fixed in the mantle frame. Not a climbable pipe. Caldera: Collapse crater after a large eruption. Yellowstone’s track is dated calderas. Age-progressive chain: Volcanoes that get older away from the active centre, recording plate motion. Intraplate volcanism: Melting inside a plate, not at a ridge, trench, or transform. Partial melt: A fraction of the rock is liquid. A plume is not a magma ocean. Guyot: An eroded, drowned volcano on a hotspot track, often now an atoll or bank. Exam language also accepts “Flat-topped seamount”.

Exam-language toggle (the Teacher tab) swaps UK/US pairs where they exist — levée/levee, arête/arete — so a mixed room is not punished for spelling.

Close the slot

Without WebGL the caption still teaches the exception. Hawaii is young at the southeast end, older seamounts northwest. The plume stays; the Pacific plate slides. Yellowstone is a second plume under a continent, ages older to the southwest. Iceland is a ridge, not this story. Cascadia is subduction, not this story. The United Kingdom is not on either track. If JavaScript is off you still have the glossary and Check. Sketch a fixed dot and a sliding plate with dated volcanoes. That drawing is the lab. Two dots if you add Yellowstone. Never one pipe feeding both.

Finish in Check — ten questions, not a mood. The bank mixes definition, process, the misconception you just killed, a named place, and a read-the-model item (click the part; T). If a pupil can only recite the hook, they have not used the geometry. Wrong answers still show the one-line explain. Do not skip the explain.

Sources on the Teacher tab are the trail, not a bibliography to copy. USGS HVO; USGS YVO.

Link back to the live lab and keep the same slug. Do not invent a parallel worksheet that contradicts T, SI, or the named parts.

This note is worldwide. Curriculum tags (GCSE; NGSS MS-ESS2-3) are filters, not a flag. A class in Nairobi, London, or Shanghai can use the same 3D. Ages (GCSE, A-level, NGSS MS, HS Earth Sci) are a suggested band. If a sentence only works in one exam board, rewrite it before you project it.

Write these three lines on the board before you dim the lights. One: Hawaii and Yellowstone are holes the plate is sliding over — not the same as a plate edge. Two: the misconception “All volcanoes are plate-boundary volcanoes.”. Three: the named parts they must click. Then drive the model. Check is ten questions covering definition, process, the misconception, a place, and a read-the-model item. Do not skip the explain on a wrong answer.

Board, units, and what not to say

SI first. Metres, kilometres, degrees Celsius, metres per second. A conversion in brackets is courtesy, not a second system. Do not let a pupil leave thinking the 3D is a photograph. It is a teaching model. Where vertical exaggeration exists, T collapses it and the caption says so.

Do not say “teaching mesh”, “sprinkle”, or “thin free surface not a fat pipe” out loud. Say the landform. Seasons are ~23.44° of axial tilt, not Earth–Sun distance. The outer core is liquid; S-waves do not pass. Yosemite is a glacial U-trough. San Andreas is a transform. Hawaiʻi and Yellowstone are hotspots. Florida is not a glacial trough.

If the room is noisy, projector layout (P) is the back-row setting: one idea, large type, the model still live. Full screen (F). Labels (L). Space plays. Arrows nudge time. R resets. The URL can remember hawaii, yellowstone. Send them home with the same link; there is no login.

In-site film

What Are Volcanoes? Crash Course Geography #20. Crash Course Geography. Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off. Autoplay off.